Check-valve



(NoMoael.)

W. T'. MES'SINGER.

. 6556K VALVE. No. 346,600. Patented Aug. s, 1686..

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SPECIFICATION forming part of Letters Patent No. 346,600, dated August3, 1886.

Application filed November 26, 1884. Serial No. 148,878. @No model) Toall whom) t may concern:

Be it known that I, WILLIAM T. MESSINGER, of Cambridge, county ofMiddlesex, State of Massachusetts,have invented an Improvement inCheck-Valves, of which the following description, in connection with theaccompanying drawings, is a speciiication, like letters on the drawingsrepresenting like parts.

My invention is embodied in a check-valve for limiting the flow of aiuid to one direction. The check-valve consists, essentially, of a caseor shell having an inlet-passage of sufficient vsize to accommodate theow of fluid desired,A

the said passage terminating in a valve-seat surrounded by the mainchamber, which, as shown in this instance, constitutes a guide in whichthe valve proper has a longitudinal sliding movement.

The valve proper consists, essentially, of a disk or diaphragm,preferably of somewhat yielding material, supported in a frame providedwith a guide, shown in this instance as consisting of projectionscooperating with the walls ofthe guide-.chamber around the valveseat,there being suficient space around the valveand between the guideprojections to permit the fiow of fluid when the valve is unseated.

The valve-seat projects toward the valve, the yielding portion ordiaphragm of which is eX- posed to the back-pressure of the fluidcontrolled by the valve,.and is thus pressed closely in itsseat,sealing. the passage tightly without the necessity of accuratefitting between the valve and seat.

In providing buildings with piping for heating and other purposes thepipes are usually put together with right-hand-threaded screwsthroughout the building, from which arrangement it results that if forany reason a piece' of pipe has to be removed the entire piping beyondthis point has to be unscrewed. In order to obviate this objectiomwherethe piping is provided with a check-valve in accordance with thisinvention, the valve-casing is screwthreaded at both ends and connectedby coupling-pieces with the piping at either side of it, and thus may bereadily disconnected from the piping without disturbing the remainder ofthe piping. The coupling-piece at one end of the casing forms a stop forthe valve, and when the casin g is uncoupled and removed from the pipethe valve proper may be readily removed therefrom, if desired.

Figure l isa longitudinal section of a checkvalve embodying thisinvention; Figs. 2 and 3, opposite end elevations of the valve; Fig. 4,an elevation, partly in section, showing the valve-casing removed fromthe piping and the valve proper removed from the casing, as may berequired for repairs; Fig. 5, a longitudinal section showing a modifiedform of casing, and Fig. 6 an elevation of an elbow-tting adaptedtobecoupled to thecasing ofthe check-valve.

The valve-casing a is provided at one end vwith an inlet-passage, b,which terminates in a valve-seat projecting into and surrounded by themain portion of the chamber a, the internal bore of which Vis greaterthan the external diameter of the raised seat and passage b. The valveproper,c, consists of a disk or diaphragm, which will usually becomposed of rubber or other somewhat yielding or flexible material, thesaid disk being supported at its edges in an annular frame or ring, d,in which it is-secured by a nut, e, preferably provided with openings,asshown in Figsfl and 2,permitting the fluid to press directly upon thedisk c when the pressure is less in the inlet-passage b than on theother side of the valve, so as to force it into the closest possibleengagement with the valve-seat. The ring cl is provided with eX- ternalguide projections,f, which t within the chamber a and guide the valve inits longitudinal movement toward and from its seat, the space betweenthe said projections and between the ring and inne-r wall of the casinga being sufficient for the passage ofthe fluid when the valve isunseated by the pressure of the said iuid in the passage b.

The casing a is threaded at each end to receive coupling-nuts g, bywhich it may be connected with coupling-pieces h at the end ofthecasing. The coupling-piece 7L at the end of the casing opposite theinlet-passage b serves as a stop to limit the movement of the valve fromits seat, the projections f engaging the said coupling-piece andarresting the said valvein the casing when there is ample space for theilow of the fluid around the valve and between the said projections,which lare longer than IOO the width of the ring in the direction of itsmovement, as best shown in Fig. 4.

WVhen the couplings g are unscrewed, as shown in Fig. 4, the case a maybe detached from the pipes,and the valve then is free to slip out fromthe said easing, thus affording access to the valve and seat for thepurpose of cleaning and repairing the same, if required. Thecoupling-piece h may be a portion or" any desired kind of pipe-litting,it being shown, for instancein Fig. 6, as a portion ofan elbow-fit ting,thus enabling the check-valve to be readily applied at an angle in thepiping.

\Vhen the check-valve is to be employed at 0r near the end of thepiping, it may be constructed as shown in Fig. the case being threadedat or near the inlet end to connect directly With the piping, and beingthreaded at its other end to receive a ring, 7s, which serves as a stopfor the movement ofthe valve in the case a, the said ring itself servingas a disch arge-passage,or receiving within it a discharge-pipe, m, asmay be desired.

By permitting the iiuid to press directly on the disk or diaphragm c thelatter makes a tight it on itsl seat, thereby obviating the grinding orcareful fitting required when a metal valve engages a metal seat.

I claim- 1. The valve-casing provided with a raised or proj eotingvalve-seat, combined with a valve composed of a rigid ring or frame andyielding disk'xed at its edges therein, and acted upon within its edgeslby the fluid controlled by the valve, substantially as described.

2. A check-valve composed of a casing or chamber having an inlet-passageterminating 'in a valve-seat, combined with a valve comprising a ringprovided with guide projections longer than the width of the ring,co-operating with the said chamber, the space between the said guideprojections permitting the ow of 4.o

iiuid when the valve is unseated, substantially as described.

3. The casing or chamber having an inletpassage terminating inavalve-seat, combined with the valve consisting of a ring provided withprojections engaging and guided by the inner wall of the chamber, and ayielding disk confined at its edges in the said ring, and having itssurfaces exposed to the pressure of the fluid controlled by the valve,substantially as described.

4. The valve-casing provided with a raised or projecting valve-seat, anda valve comprising a ring or frame arranged in said casing, and providedwith guide projections longer than the Width of the ring, andco-operating with the said easing, the space between the said guideprojections permitting thcllow of fluid when the valve isinserted,combined with a coupling serving to limit the movement of thevalve in one direction, substantially as de scribed.

ln testimony whereof I have signed my name to this specification inthepresence of two subscribing witnesses.

WVM. T. MESSINGER.

Vitnesses:

Jos. P. LIvERMoRn, W. H. Sres'roN.

